Zero default LW

[gherkins]

Having a default LW greater than 0 resulted in an unnecessary connection between nodes, even with 0 values in the matrix.
Like, for example, in this LDA topic modelling results:

[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 294861, 102379, 0, 0, 0]
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 179786, 0, 0, 0]
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 123373, 0, 0]
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 114517]
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 88530]
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 67675, 0]
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 63946, 0, 0]
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 63348, 0, 0, 0, 0]
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 62784, 0]
[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 60785, 0, 0, 0, 0]
[294861, 0, 0, 0, 0, 0, 0, 63348, 0, 60785, 0, 0, 0, 0, 0]
[102379, 179786, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]
[0, 0, 123373, 0, 0, 0, 63946, 0, 0, 0, 0, 0, 0, 0, 0]
[0, 0, 0, 0, 0, 67675, 0, 0, 62784, 0, 0, 0, 0, 0, 0]
[0, 0, 0, 114517, 88530, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0]

Topics (last 5 cols & rows) wouldn't have connection to each other but had been referenced with a minimum width connection.
Leaving LW at 0 per default, resulted in a much cleaner correct diagram.